354 ENTOZOA. 
StTroneyius, Mull.(1) 
Where the body is round, and the anus of the male is enveloped by 
a sort of bursa, variously shaped, from which issues a little thread 
that appears to be an organ of generation. These two last charac- 
ters are wanting in the female, which has sometimes caused her to be 
taken for an Ascaris. 
In some of these Strongyli the mouth is ciliate or dentated. Such 
is * 
S. equinus, Gm.; Str. armatus, Rud.; Mill., Zool. Dan., II, 
xliiz; Encyc. Méthod., XXXVI, 7—15. Two inches in length; 
head hard and spherical, and the mouth surrounded by small, 
soft spines; bursa of the male trifoliate. Of all the Worms 
that infest the Horse, this is the most common; it even pene- 
trates into the arteries where it occasions aneurisms. It is 
also found in the Ass and Mule. ; 
The mouth of others is merely surrounded by tubercles or papil- . 
le. Such particularly is the 
S. gigas, Rud.; Ascaris visceralis and Asc. renalis, Gm.; Redi., 
An. Viv. in An. Viv., pl. VIII and IX; Le Diocrorpnyme, 
Collet-Meygret, Journ. de Phys., LV, p. 458. The most vo- 
luminous of all known intestinal Worms; it is upwards of two 
or three feet in length, and as thick as the little finger. The 
most singular circumstance attending this Strongylus is that it 
is most usually developed in one of the kidneys of various ani- 
mals, such as the Wolf, Dog, Mink, and even Man, where it 
lies doubled up, distending that organ, destroying its paren- 
chyma, and probably occasioning the most excruciating agony 
to the animal in which it resides. It has been occasionally 
known to pass off with the urine, while yetsmall. It sometimes 
inhabits other viscera. Its usual colour is a beautiful red; the 
mouth is surrounded with six papille; the intestine is straight 
and transversely rugose, the ovary simple, three or four times 
the length of the body, communicating exteriorly by a hole a 
little distance posterior to the mouth, and, as it appears, by 
the other extremity with the anus. An extremely attenuated 
white thread that extends along the abdomen is considered by 
M. Otto as the nervous system(2). . 
(1) Srpozyzuacs, round. 
(2) Otto, Magas., of the Soc. Nat. Berl., 1816, p. 225, pl. v. 
